What is one difference between closed and open primary

The distinction simply changes which party's primary registered voters are allowed to vote in. An open primary allows any registered voter to cast her ballot in either party's primary, while a closed primary mandates that voters registered with a party vote in that party's primary.

Closed primaries promote party unity, while open primaries encourage opinions from a range of voters.

Explanation:

(APEX)

basic principles: federalism, separation of powers, checks and balances, judicial review, representative democracy, limited government, rule of law, individual rights and responsibilities, consent of the governed, majority rule, popular sovereignty, equal protection.